This is what Paul had to say in Romans about The Jews and the Law regarding circumcision.
'Circumcision has value if you observe the law, but of you break the law, you have become as though you had not been circumcised. If those who are not circumcised keep the law's requirements, will they not be regarded as though they were circumcised? The one who is not circumcised physically and yet obeys the law will condemn you who, even though you have the written code and circumcision, are a lawbreaker. A man is not a Jew if he is only one outwardly, nor is a circumcision merely outward and physical. No, a man is a Jew if he is one inwardly; and a circumcision is circumcision of the heart, by the Spirit, not by the written code. Such a man's praise is not from men, but from God. Romans 2:25-29
It is also interesting to learn that the traditional circumcision had nothing to do with removing the entire foreskin. A tiny slit was many for a few drops of blood to enter into a covenant with God. In paintings of baby Jesus, he was INTACT. Here is a great link that goes into more detail.
As far as thinking that circumcision is a Christian thing, it is not. By following the old covenant, we are denying the new covenant in Christ and renouncing that he came to save us. It has been clearly stated that there is no medical reason for circumcision and there is no religious reason either, point blank, this does not need to be done. As far as someone saying that they like the look of a circumcise penis, get over yourself. It is your son that has to live with the choice, not you. If he decides that he wants it done after he is 18, that's his choice to make. It is a severe violation of human rights to do this to an innocent baby that has no say in the matter. There is a bill being brought forward in Mass. to make it illegal to practice genital mutilation, lets make our voices heard and make sure that this legislation is brought about in every state. Here is the web site, this is current legislation, their will be a public meeting on March 2, 2010 at 1:00 pm.